Abstract
The complex scalar dark matter (DM) candidate in the gauged two Higgs doublet model (G2HDM), stabilized by a peculiar hidden parity ($h$-parity), is studied in detail. We explore the parameter space for the DM candidate by taking into account the most recent DM constraints from various experiments, in particular, the PLANCK relic density measurement and the current DM direct detection limit from XENON1T. We separate our analysis in three possible compositions for the mixing of the complex scalar. We first constrain our parameter space with the vacuum stability and perturbative unitarity conditions for the scalar potential, LHC Higgs measurements, plus Drell-Yan and electroweak precision test constraints on the gauge sector. We find that DM dominated by composition of the inert doublet scalar is completely excluded by further combining the previous constraints with both the latest results from PLANCK and XENON1T. We also demonstrate that the remaining parameter space with two other DM compositions can be further tested by indirect detection like the future CTA gamma-ray telescope.
Highlights
Dark matter (DM) has become one of the most discussed topics in cosmology, astrophysics, and particle physics
Our strategy is to determine the parameter space in G2HDM allowed by the current relic density measurement, and the limits deduced from dark matter (DM) direct detection, DM indirect detection, and collider search
The G2HDM is a novel two-Higgs-doublet model with a stable DM candidate protected by an accidental discrete symmetry (h parity) without the need of imposing it by hand as in the inert Higgs doublet model (IHDM)
Summary
Dark matter (DM) has become one of the most discussed topics in cosmology, astrophysics, and particle physics. It has been determined that G2HDM has a viable scalar sector parameter space [34], compatible with vacuum stability and perturbative unitarity conditions, as well as Higgs phenomenology constraints from the LHC. The gauge sector is constrained by electroweak precision tests (EWPT) [35], setting limits on the masses of the new gauge bosons and the gauge sector parameter space It is precisely these two recent studies on the scalar and gauge sectors constraints (SGSC) that we will take as starting point for our study, ensuring that the final constrained parameter space is consistent with previous studies and that our result has a stronger relevance.
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